Title: Anisotropic thermal characteristics of graphene-embedded polyimide composite sheets
Page Range: p.315-322
Author(s): Seong-Yeob Park; Jong-Seong Bae; Jin-Gyu Kim; Min-Wook Oh; Jungsoo Kim; Dae-Geun Nam; Jeong Hyun Yeum; Weontae Oh
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 24
Issue No: No.5
Abstract
Polyimide-graphene (PIG) composites were prepared, and their thermal properties were characterised as films or sheets. Graphene loadings were controlled up to 8 wt.% or 12 wt.% in their composites. The graphenes used in this work were prepared by the chemical treatment of graphite. The as-prepared polyimide-graphene composites were thermally characterised in films or sheets. The thermal conductivities of the PIG sheets were separately analysed in both in-plane and out-of-plane directions. The thermal expansion coefficients (TECs) of the PIG composites slightly changed with the amount of graphene added to the composites. The in-plane thermal conductivities were higher than the out-of-plane thermal conductivities, and the thermal conductivities of both directions proportionally increased with the graphene loadings in the PIG composites. The temperature-dependent stresses of the composite films monotonically decreased with the graphene loadings. The experimentally obtained thermal characteristics of the polyimide-graphene composites were compared and discussed on the basis of the composite morphologies. 37 Refs.
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